About NexLookup
NexLookup is a professional medical billing lookup platform for revenue cycle teams, coding staff, and billing agencies.
Our mission
Give RCM professionals fast, accurate, privacy-conscious access to the code sets and provider data they use every day — without a heavyweight encoder and without collecting patient information.
What we offer
- Free core tools — ICD-10-CM lookup, CARC/RARC denial codes, and single NPI registry search. No payment required.
- Pro agency tools — Bulk NPI verification, modifiers, POS, HCPCS, taxonomy, revenue codes, Type of Bill, NCCI checks, calculators, checklists, appeal drafts, and more.
- Public API — Read-only JSON endpoints for integrations (rate-limited).
Who it is for
- Medical billing companies and RCM agencies
- Professional coders and coding educators
- Provider enrollment and credentialing staff
- Auditors and denial management teams
Data sources
NexLookup uses publicly available CMS and related reference sources, including ICD-10-CM order files, claim adjustment and remark code lists, the NPPES NPI registry, and optional CMS/NUCC files you import. Content is for educational and operational reference.
What we are not
NexLookup is not a certified encoder, not a substitute for official CMS or payer systems of record, and not medical, coding, or legal advice. Always confirm payment decisions against payer policy and official publications.
Contact
Questions, partnerships, or support: